<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <!-- 左 -->
      <div>
        <img src="../assets/logo.png" alt="" />
        <span>Lispy电商后台管理系统</span>
      </div>
      <!-- 右 -->
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#ffd04b" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
                <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
                <!-- 二级菜单 -->
                <el-menu-item :index="'/' + childItem.path + ''" v-for="childItem in item.children" :key="childItem.id" @click="saveNavState('/' + childItem.path)">
                    <!-- 二级菜单的模板区域 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本 -->
                        <span>{{childItem.authName}}</span>
                    </template>
                </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 主体 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 左侧菜单是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  // 在created阶段请求左侧菜单数据
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出登录功能
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      // 发送请求获取左侧菜单数据
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) {
        return this.$message.console.error(res.meta.msg)
      }
      // console.log(res)
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style Lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
}
.el-header div {
  display: flex;
  align-items: center;
}
.el-header div img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
}
.el-header div span {
  margin-left: 15px;
}
.el-aside {
  background-color: #333744;
}
.el-aside .el-menu {
  border-right: 0;
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  padding-right: 10px;
}
.toggle-button{
  color: #fff;
  font-size: 10px;
  letter-spacing: 0.2em;
  line-height: 24px;
  text-align: center;
  background-color: #fefefe27;
  cursor: pointer;
}
</style>
